Being forewarned of the constant presence of an enemy the most daring, the most powerful, the most crafty, the most indefatigable, the most completely equipped with all the engines and the most expert in the science of war, let us not allow ourselves to be overtaken by sloth or cowardice, but, on the contrary, with minds aroused and ever on the alert, let us stand ready to resist; and, knowing that this warfare is terminated only by death, let us study to persevere. Above all, fully conscious of our weakness and want of skill, let us invoke the help of God, and attempt nothing without trusting in him, since it is his alone to supply counsel, and strength, and courage, and arms.

~ Institutes of the Christian Religion, Book 1, Chapter 14, Part 13, by John Calvin